:root {
  --theme: #3b82f6;
  --ink: #e8edf5;
  --ink-dim: #9fb0c9;
  --ink-faint: #6b7a93;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(1100px 640px at 72% -12%, rgba(59, 130, 246, 0.16) 0%, transparent 60%),
    radial-gradient(900px 600px at 8% 108%, rgba(99, 102, 241, 0.10) 0%, transparent 55%),
    linear-gradient(160deg, #0c1322 0%, #080d18 58%, #060a12 100%);
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
}

.hero {
  position: relative;
  z-index: 1;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 48px 24px 24px;
}

.kicker {
  margin: 0 0 18px;
  font-size: 0.72rem;
  letter-spacing: 0.42em;
  text-indent: 0.42em;
  color: var(--ink-faint);
  user-select: none;
}

h1 {
  margin: 0 0 16px;
  font-size: clamp(2.2rem, 6vw, 3.6rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.25;
}

.desc {
  margin: 0 0 44px;
  max-width: 34em;
  font-size: clamp(0.95rem, 2vw, 1.12rem);
  line-height: 1.9;
  color: var(--ink-dim);
}

.enter-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 36px;
  border-radius: 999px;
  color: #fff;
  text-decoration: none;
  font-size: 1.02rem;
  letter-spacing: 0.1em;
  text-indent: 0.05em;
  background: var(--theme);
  background: linear-gradient(135deg, var(--theme), color-mix(in srgb, var(--theme) 46%, #0b1120));
  border: 1px solid color-mix(in srgb, var(--theme) 55%, transparent);
  box-shadow: 0 8px 28px color-mix(in srgb, var(--theme) 30%, transparent);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.enter-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px color-mix(in srgb, var(--theme) 40%, transparent);
}

.enter-btn:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 3px;
}

.enter-btn .arrow { transition: transform 0.2s ease; }
.enter-btn:hover .arrow { transform: translateX(4px); }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}

.enter-btn.ghost {
  background: transparent;
  border-color: color-mix(in srgb, var(--theme) 45%, transparent);
  box-shadow: none;
}

.enter-btn.ghost:hover {
  background: color-mix(in srgb, var(--theme) 10%, transparent);
}

.foot {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 18px 12px calc(20px + env(safe-area-inset-bottom));
  font-size: 0.82rem;
  color: var(--ink-faint);
}

.foot .icp {
  margin-left: 10px;
  color: var(--ink-faint);
  text-decoration: none;
}

.foot .icp:hover {
  color: var(--ink-dim);
  text-decoration: underline;
}

[hidden] { display: none !important; }

@media (prefers-reduced-motion: reduce) {
  .enter-btn, .enter-btn .arrow { transition: none; }
  .enter-btn:hover { transform: none; }
}